The thing is, my aerobic low end endurance is great. I can quite comfortably run 5:40 pace, without any strain at all, and I can run for long at a relatively hard pace without straining, like 5:40's. Additionally, I recover amazingly fast between reps on the track. But I can't seem to run effectively at faster paces, like down towards 5:00's and below.
I understand it is a matter of just running at faster paces, but any further advice would be appreciated.